All depends on your perspective as to what YOU want outta your truck, and why we buy diesels rather than gasser rigs. It also involves other operational advantages traditionally provided by diesels vs gassers.
Certainly, if drag racing is your bag, the V8's clearly hold the advantage due to their higher reving ability while developing power - but the NEED for higher revs to develop power has been precisely why diesels have been used in heavy-duty use to begin with.
Typically, higher reving engines wear out faster, consume more fuel, and are generally less reliable than slower reving engines. Unfortunately, as inline engines like our Cummins work to maintain power equality with the V8's - as well as meet ever tightening EPA mandates, the traditional advantages of inline design seems to erode as well.
If all I wanted was a peppy commute rig, I probably would be quite happy with a V8 - and probably a gas rig instead of diesel, since the latest gassers seem quite capable of the same long engine life as diesels, they do it at cheaper original cost, and gas prices in most areas are less than diesel.
Yeah, this "diesel thing", as well as V8 vs inline 6 is LOTS muddier than it was 10 or 15 years ago...